/* * This file is part of wl1271 * * Copyright (C) 2008-2009 Nokia Corporation * * Contact: Luciano Coelho * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA * */ #include #include #include #include #include #include #include #include "wl12xx.h" #include "wl12xx_80211.h" #include "io.h" #include "reg.h" #define WSPI_CMD_READ 0x40000000 #define WSPI_CMD_WRITE 0x00000000 #define WSPI_CMD_FIXED 0x20000000 #define WSPI_CMD_BYTE_LENGTH 0x1FFE0000 #define WSPI_CMD_BYTE_LENGTH_OFFSET 17 #define WSPI_CMD_BYTE_ADDR 0x0001FFFF #define WSPI_INIT_CMD_CRC_LEN 5 #define WSPI_INIT_CMD_START 0x00 #define WSPI_INIT_CMD_TX 0x40 /* the extra bypass bit is sampled by the TNET as '1' */ #define WSPI_INIT_CMD_BYPASS_BIT 0x80 #define WSPI_INIT_CMD_FIXEDBUSY_LEN 0x07 #define WSPI_INIT_CMD_EN_FIXEDBUSY 0x80 #define WSPI_INIT_CMD_DIS_FIXEDBUSY 0x00 #define WSPI_INIT_CMD_IOD 0x40 #define WSPI_INIT_CMD_IP 0x20 #define WSPI_INIT_CMD_CS 0x10 #define WSPI_INIT_CMD_WS 0x08 #define WSPI_INIT_CMD_WSPI 0x01 #define WSPI_INIT_CMD_END 0x01 #define WSPI_INIT_CMD_LEN 8 #define HW_ACCESS_WSPI_FIXED_BUSY_LEN \ ((WL1271_BUSY_WORD_LEN - 4) / sizeof(u32)) #define HW_ACCESS_WSPI_INIT_CMD_MASK 0 /* HW limitation: maximum possible chunk size is 4095 bytes */ #define WSPI_MAX_CHUNK_SIZE 4092 #define WSPI_MAX_NUM_OF_CHUNKS (WL1271_AGGR_BUFFER_SIZE / WSPI_MAX_CHUNK_SIZE) static inline struct spi_device *wl_to_spi(struct wl1271 *wl) { return wl->if_priv; } static struct device *wl1271_spi_wl_to_dev(struct wl1271 *wl) { return &(wl_to_spi(wl)->dev); } static void wl1271_spi_disable_interrupts(struct wl1271 *wl) { disable_irq(wl->irq); } static void wl1271_spi_enable_interrupts(struct wl1271 *wl) { enable_irq(wl->irq); } static void wl1271_spi_reset(struct wl1271 *wl) { u8 *cmd; struct spi_transfer t; struct spi_message m; cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); if (!cmd) { wl1271_error("could not allocate cmd for spi reset"); return; } memset(&t, 0, sizeof(t)); spi_message_init(&m); memset(cmd, 0xff, WSPI_INIT_CMD_LEN); t.tx_buf = cmd; t.len = WSPI_INIT_CMD_LEN; spi_message_add_tail(&t, &m); spi_sync(wl_to_spi(wl), &m); wl1271_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN); kfree(cmd); } static void wl1271_spi_init(struct wl1271 *wl) { u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd; struct spi_transfer t; struct spi_message m; cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); if (!cmd) { wl1271_error("could not allocate cmd for spi init"); return; } memset(crc, 0, sizeof(crc)); memset(&t, 0, sizeof(t)); spi_message_init(&m); /* * Set WSPI_INIT_COMMAND * the data is being send from the MSB to LSB */ cmd[2] = 0xff; cmd[3] = 0xff; cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX; cmd[0] = 0; cmd[7] = 0; cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3; cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN; if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0) cmd[5] |= WSPI_INIT_CMD_DIS_FIXEDBUSY; else cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY; cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS; crc[0] = cmd[1]; crc[1] = cmd[0]; crc[2] = cmd[7]; crc[3] = cmd[6]; crc[4] = cmd[5]; cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1; cmd[4] |= WSPI_INIT_CMD_END; t.tx_buf = cmd; t.len = WSPI_INIT_CMD_LEN; spi_message_add_tail(&t, &m); spi_sync(wl_to_spi(wl), &m); wl1271_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN); kfree(cmd); } #define WL1271_BUSY_WORD_TIMEOUT 1000 static int wl1271_spi_read_busy(struct wl1271 *wl) { struct spi_transfer t[1]; struct spi_message m; u32 *busy_buf; int num_busy_bytes = 0; /* * Read further busy words from SPI until a non-busy word is * encountered, then read the data itself into the buffer. */ num_busy_bytes = WL1271_BUSY_WORD_TIMEOUT; busy_buf = wl->buffer_busyword; while (num_busy_bytes) { num_busy_bytes--; spi_message_init(&m); memset(t, 0, sizeof(t)); t[0].rx_buf = busy_buf; t[0].len = sizeof(u32); t[0].cs_change = true; spi_message_add_tail(&t[0], &m); spi_sync(wl_to_spi(wl), &m); if (*busy_buf & 0x1) return 0; } /* The SPI bus is unresponsive, the read failed. */ wl1271_error("SPI read busy-word timeout!\n"); return -ETIMEDOUT; } static void wl1271_spi_raw_read(struct wl1271 *wl, int addr, void *buf, size_t len, bool fixed) { struct spi_transfer t[2]; struct spi_message m; u32 *busy_buf; u32 *cmd; u32 chunk_len; while (len > 0) { chunk_len = min((size_t)WSPI_MAX_CHUNK_SIZE, len); cmd = &wl->buffer_cmd; busy_buf = wl->buffer_busyword; *cmd = 0; *cmd |= WSPI_CMD_READ; *cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH; *cmd |= addr & WSPI_CMD_BYTE_ADDR; if (fixed) *cmd |= WSPI_CMD_FIXED; spi_message_init(&m); memset(t, 0, sizeof(t)); t[0].tx_buf = cmd; t[0].len = 4; t[0].cs_change = true; spi_message_add_tail(&t[0], &m); /* Busy and non busy words read */ t[1].rx_buf = busy_buf; t[1].len = WL1271_BUSY_WORD_LEN; t[1].cs_change = true; spi_message_add_tail(&t[1], &m); spi_sync(wl_to_spi(wl), &m); if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1) && wl1271_spi_read_busy(wl)) { memset(buf, 0, chunk_len); return; } spi_message_init(&m); memset(t, 0, sizeof(t)); t[0].rx_buf = buf; t[0].len = chunk_len; t[0].cs_change = true; spi_message_add_tail(&t[0], &m); spi_sync(wl_to_spi(wl), &m); wl1271_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd)); wl1271_dump(DEBUG_SPI, "spi_read buf <- ", buf, chunk_len); if (!fixed) addr += chunk_len; buf += chunk_len; len -= chunk_len; } } static void wl1271_spi_raw_write(struct wl1271 *wl, int addr, void *buf, size_t len, bool fixed) { struct spi_transfer t[2 * WSPI_MAX_NUM_OF_CHUNKS]; struct spi_message m; u32 commands[WSPI_MAX_NUM_OF_CHUNKS]; u32 *cmd; u32 chunk_len; int i; WARN_ON(len > WL1271_AGGR_BUFFER_SIZE); spi_message_init(&m); memset(t, 0, sizeof(t)); cmd = &commands[0]; i = 0; while (len > 0) { chunk_len = min((size_t)WSPI_MAX_CHUNK_SIZE, len); *cmd = 0; *cmd |= WSPI_CMD_WRITE; *cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH; *cmd |= addr & WSPI_CMD_BYTE_ADDR; if (fixed) *cmd |= WSPI_CMD_FIXED; t[i].tx_buf = cmd; t[i].len = sizeof(*cmd); spi_message_add_tail(&t[i++], &m); t[i].tx_buf = buf; t[i].len = chunk_len; spi_message_add_tail(&t[i++], &m); wl1271_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd)); wl1271_dump(DEBUG_SPI, "spi_write buf -> ", buf, chunk_len); if (!fixed) addr += chunk_len; buf += chunk_len; len -= chunk_len; cmd++; } spi_sync(wl_to_spi(wl), &m); } static irqreturn_t wl1271_hardirq(int irq, void *cookie) { struct wl1271 *wl = cookie; unsigned long flags; wl1271_debug(DEBUG_IRQ, "IRQ"); /* complete the ELP completion */ spin_lock_irqsave(&wl->wl_lock, flags); set_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags); if (wl->elp_compl) { complete(wl->elp_compl); wl->elp_compl = NULL; } spin_unlock_irqrestore(&wl->wl_lock, flags); return IRQ_WAKE_THREAD; } static int wl1271_spi_set_power(struct wl1271 *wl, bool enable) { if (wl->set_power) wl->set_power(enable); return 0; } static struct wl1271_if_operations spi_ops = { .read = wl1271_spi_raw_read, .write = wl1271_spi_raw_write, .reset = wl1271_spi_reset, .init = wl1271_spi_init, .power = wl1271_spi_set_power, .dev = wl1271_spi_wl_to_dev, .enable_irq = wl1271_spi_enable_interrupts, .disable_irq = wl1271_spi_disable_interrupts, .set_block_size = NULL, }; static int __devinit wl1271_probe(struct spi_device *spi) { struct wl12xx_platform_data *pdata; struct ieee80211_hw *hw; struct wl1271 *wl; unsigned long irqflags; int ret; pdata = spi->dev.platform_data; if (!pdata) { wl1271_error("no platform data"); return -ENODEV; } hw = wl1271_alloc_hw(); if (IS_ERR(hw)) return PTR_ERR(hw); wl = hw->priv; dev_set_drvdata(&spi->dev, wl); wl->if_priv = spi; wl->if_ops = &spi_ops; /* This is the only SPI value that we need to set here, the rest * comes from the board-peripherals file */ spi->bits_per_word = 32; ret = spi_setup(spi); if (ret < 0) { wl1271_error("spi_setup failed"); goto out_free; } wl->set_power = pdata->set_power; if (!wl->set_power) { wl1271_error("set power function missing in platform data"); ret = -ENODEV; goto out_free; } wl->ref_clock = pdata->board_ref_clock; wl->tcxo_clock = pdata->board_tcxo_clock; wl->platform_quirks = pdata->platform_quirks; #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32) irqflags = IRQF_TRIGGER_RISING; #else if (wl->platform_quirks & WL12XX_PLATFORM_QUIRK_EDGE_IRQ) irqflags = IRQF_TRIGGER_RISING; else irqflags = IRQF_TRIGGER_HIGH | IRQF_ONESHOT; #endif wl->irq = spi->irq; if (wl->irq < 0) { wl1271_error("irq missing in platform data"); ret = -ENODEV; goto out_free; } #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,31) ret = compat_request_threaded_irq(&wl->irq_compat, wl->irq, wl1271_hardirq, wl1271_irq, irqflags, DRIVER_NAME, wl); #else ret = request_threaded_irq(wl->irq, wl1271_hardirq, wl1271_irq, irqflags, DRIVER_NAME, wl); #endif if (ret < 0) { wl1271_error("request_irq() failed: %d", ret); goto out_free; } disable_irq(wl->irq); ret = wl1271_init_ieee80211(wl); if (ret) goto out_irq; ret = wl1271_register_hw(wl); if (ret) goto out_irq; return 0; out_irq: #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,31) compat_free_threaded_irq(&wl->irq_compat); #else free_irq(wl->irq, wl); #endif out_free: wl1271_free_hw(wl); return ret; } static int __devexit wl1271_remove(struct spi_device *spi) { struct wl1271 *wl = dev_get_drvdata(&spi->dev); wl1271_unregister_hw(wl); #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,31) compat_free_threaded_irq(&wl->irq_compat); compat_destroy_threaded_irq(&wl->irq_compat); #else free_irq(wl->irq, wl); #endif wl1271_free_hw(wl); return 0; } static struct spi_driver wl1271_spi_driver = { .driver = { .name = "wl1271_spi", .bus = &spi_bus_type, .owner = THIS_MODULE, }, .probe = wl1271_probe, .remove = __devexit_p(wl1271_remove), }; static int __init wl1271_init(void) { return spi_register_driver(&wl1271_spi_driver); } static void __exit wl1271_exit(void) { spi_unregister_driver(&wl1271_spi_driver); } module_init(wl1271_init); module_exit(wl1271_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Luciano Coelho "); MODULE_AUTHOR("Juuso Oikarinen "); MODULE_FIRMWARE(WL127X_FW_NAME); MODULE_FIRMWARE(WL128X_FW_NAME); MODULE_ALIAS("spi:wl1271");